technology #Research #Threats #Apache #Backdoor #Brickstorm #China #CybersecurityAndInfrastructureSecurityAgencyCISA #DellTechnologies #GoogleThreatIntelligenceGroup #Grimbolt #Hacking #Malware #Mandiant #SilkTyphoon #UNC5221 #UNC6201 #VirtualMachines #Vulnerability #ZeroDay #ZeroDayExploit Chinese hackers exploited a Dell zero-day for 18 months before anyone noticed CyberScoop Feb 18